Butterfly Valves
Bray - Resilient Seated Butterfly Valve - Series 31U
Reliable Bubble-Tight Shutoff for High-Pressure Environments in Industrial Use
Bray's Series 31U resilient seated butterfly valve is specifically designed for onshore and offshore fire protection where the applicable certification is D.O.T. 54 (UK Department of Trade). The series 31U is designed to withstand high line velocities and pressure.
Specification / Detail
| Size Range | NPS 2 to 12 / DN 50 to 300 |
| Body Materials | Ductile Iron, Carbon Steel, Nickel Aluminum Bronze |
| Temperature Range | 0°F to 212°F (-18°C to 100°C) |
| Stem Materials | Stainless Steel, 17-4PH Stainless Steel, Monel K500 |
| Maximum Allowable Operating Pressure | 285 psi (20 Bar) |
| Seat Materials | Bonded BUNA-N |
| Shutoff Rating | Bidirectional Bubble-tight |
| Disc Materials | 316 Stainless Steel, Monel K500, Nickel Aluminum Bronze |
| Body Style | Lug |
| Flange Drilling | ASME Class 150, EN 1092 PN 10, 16, 25 |
| Testing Standard | API 598, EN 12266-1 |
| Certifications | ABS, ATEX, CRN, DNV, D.O.T. 54, NSF 61/372, PED, PE(S)R |
| Face to Face | API 609 Category A, EN 558 Series 20 |
| Applications | High Pressure Industrial and Marine Dead-End service, On-Shore and Off-Shore Fire Protection |